Is CVE-2011-3188 in the CISA KEV catalog?

No. CVE-2011-3188 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2011-3188?

CVE-2011-3188 has a CVSS v3 base score of 9.1 (CRITICAL).

What is the EPSS score for CVE-2011-3188?

CVE-2011-3188 has an EPSS score of 5.69% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2011-3188?

Upgrade linux kernel to 3.1 or later.

CVE & CISA-KEV Catalog

CVE-2011-3188

CRITICALEPSS 92th pctl

9.1

CVSS v3

NVD

Description

The (1) IPv4 and (2) IPv6 implementations in the Linux kernel before 3.1 use a modified MD4 algorithm to generate sequence numbers and Fragment Identification values, which makes it easier for remote attackers to cause a denial of service (disrupted networking) or hijack network sessions by predicting these values and sending crafted packets.

How to fix

Remediation Available

linux kernelNVD

Affected:< 3.1Fixed in:3.1CVE-2011-3188derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Exploit Intelligence

5.69%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Patch5

Third-Party Advisory1

marc.info

Other references3

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.